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Actions of 17β-estradiol on carbohydrate metabolism in liver, gills, and brain of gilthead sea bream Sparus auratus during acclimation to different salinities

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Abstract

The influence of gonadal maturation on seawater adaptability at the metabolic level was assessed in the euryhaline teleost Sparus auratus by treatment of immature fish with 17ß-estradiol (E2) followed by acclimation to different environmental salinities. Fish were injected with coconut oil alone (sham) or containing E2 (10 µg g−1 body weight) and maintained in seawater (40‰). After 5 days, fish from oil- and E2-implanted groups were sampled. At the same time, fish of both groups were transferred to brackish water (5‰, hypoosmotic test), seawater (40‰, transfer test), and hypersaline water (55‰, hyperosmotic test); 4 days after transfer (9 days post-implant) all groups were sampled. Data obtained from liver suggest that E2 treatment produced effects comparable to those already reported in literature, including decreased glycogen levels, increased glycolytic potential, and decreased gluconeogenic potential. This, together with the fact that many changes displayed in shams among salinities disappeared in E2-treated fish allow us to suggest that the response of liver carbohydrate metabolism to osmotic acclimation is exceeded by the response elicited by E2 treatment. In gills, E2 treatment produced increased lactate levels, decreased capacity for use of exogenous glucose, and decreased the potential of the pentose phosphate pathway. These findings suggest that the energy demand occurring in gills during osmotic acclimation should be increasingly fuelled by substrates other than exogenous glucose. Finally, data obtained in brain of E2-treated fish suggest a lower necessity of exogenous glucose, increased lactate levels, and decreased glycolytic potential.

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Acknowledgements

This work was supported by grants BOS2001-4031-C02-01 (Ministerio de Ciencia y Tecnología-FEDER, Spain) and PETRI PTR1995-0431-OP (Ministerio de Educación y Cultura, Spain) to J.M.M., and grants BOS2001-4031-C02-02 and VEM2003-20062 (Ministerio de Ciencia y Tecnología-FEDER, Spain) and PGIDT01PXI30113PR and PGIDT04PXIC31208PN (Xunta de Galicia, Spain) to J.L.S. S.S-A. was the recipient of a predoctoral fellowship from the Xunta de Galicia. R.L-C. was the recipient of an MIT-2 predoctoral fellowship from the Ministerio de Ciencia y Tecnología. The authors wish to thank Planta de Cultivos Marinos (CASEM, Universidad de Cádiz, Puerto Real, Cádiz, Spain) for providing experimental fish.

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Authors and Affiliations

  1. Laboratorio de Fisioloxía Animal, Facultade de Ciencias do Mar, Universidade de Vigo, Edificio de Ciencias Experimentais, 36200, Vigo, Spain

    S. Sangiao-Alvarellos, J. M. Míguez & J. L. Soengas

  2. Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Puerto Real, 11510, Cádiz, Spain

    J. M. Guzmán, R. Láiz-Carrión, M. P. Martín del Río & J. M. Mancera

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  1. S. Sangiao-Alvarellos
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  2. J. M. Guzmán
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  3. R. Láiz-Carrión
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  4. J. M. Míguez
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  5. M. P. Martín del Río
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  6. J. M. Mancera
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  7. J. L. Soengas
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Correspondence to J. L. Soengas.

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Communicated by S.A. Poulet, Roscoff

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Sangiao-Alvarellos, S., Guzmán, J.M., Láiz-Carrión, R. et al. Actions of 17β-estradiol on carbohydrate metabolism in liver, gills, and brain of gilthead sea bream Sparus auratus during acclimation to different salinities. Marine Biology 146, 607–617 (2005). https://doi.org/10.1007/s00227-004-1464-x

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  • DOI: https://doi.org/10.1007/s00227-004-1464-x

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